Model of coherent optical spin manipulation through hot trion states in p-doped InAs/GaAs quantum dots

TL;DR

This paper introduces a group-theoretical model based on Maxwell-pseudospin equations to explain enhanced circular dichroism in p-doped InAs/GaAs quantum dots, providing insights into spin relaxation and control for quantum tech.

Contribution

It presents a novel theoretical framework that explains experimental observations and predicts optimal conditions for spin manipulation in quantum dots.

Findings

Excellent agreement with experimental data

Identifies key spin relaxation timescales

Predicts pulse parameters for spin control

Abstract

A new generalised group-theoretical approach, based on master Maxwell-pseudospin equations, is proposed to explain recently observed enhanced circular dichroism in the excited state emission from p-doped quantum dot ensembles under resonant circularly polarised excitation into hot trion states, herein referred to as "spin-filtering effect". The theory agrees remarkably well with polarised time-resolved photoluminescence experiments, yielding largely unknown inter- and intra-shell spin relaxation time scales. This approach allows to predict optimum pulse parameters for control of spin dynamics, which will enable exploitation of the effect in all-optical spin-based quantum technologies.